The Proof 28 is a bike backpack from the brand Vaude. Designed to suit both hiking and biking, the Proof 28 is a backpack with a robust and waterproof construction. Store all your gear in the main compartment and keep your essentials close at hand in the external zippered pocket. On the outside, attach your helmet, jackets, or other poles. Made in Germany and certified Green Shape, make a choice for yourself and the planet. Waterproof roll-top closure Main compartment with laptop compartment (37 x 29 x 4 cm) and a built-in storage network Removable zippered pocket for valuables Removable compression straps Padded hip belt with pocket Helmet holder with additional packing function Reflective logo for better visibility Materials: Main fabric - Outer: 79% Polyamide, 21% Polyester (recycled); Coating: 100% Polyurethane; 400D partly recycled TPU coated; Second fabric: 100% Polyester (50% recycled); 600D Polyurethane coated 50% recycled; Lining: 100% Polyamide; 200D Polyurethane coated Volume: 28 L Dimensions: 57 x 33 x 22 cm Load weight: 3 - 8 kg Weight: 1240 g EMP Back Panel: Ergonomic Movement Panel: a lightweight, ergonomically shaped back panel. The construction allows forward movements, as well as upper body rotations (for tight turns) and stabilizes backward. It stabilizes the load and enhances the stability of the backpack's load. Laptop Compartment 15.6'': Fits laptops up to 38.5 cm wide x 27 cm deep x 2.5 cm high Vent Active Hike Back System: Small expeditions with light to normal luggage on rough terrain - Low weight and freedom of movement are essential criteria during these activities - Load transmission and backpack stability thanks to the ergonomic EMP back panel - Good ventilation thanks to the ventilation channels integrated into the padding surfaces This product is climate neutral: This product is produced in a climate-neutral manner: emissions from materials, manufacturing process, and shipping have been systematically reduced and fully compensated by the independent organization ""my climate"". Vaude Proof 28 - Cycling backpack